110 SVEN LOVEN, ON THE ECHINOIDEA DESCRIBED BY LINNyEUS. 



Arb.icia Gray. 



* Interradia uudiqiie spinigera. — Tetrapygus Ag. 



a. Areola ambulacralis tecta, verrucarum seriebus binis 

 iibique contigviis. 



1. A. fequituberculata Bly., liemisphaerica, depressi- 

 uscula, verrucis confertis, interradiorum seriebus utrinque sex; 

 epistromatis granulis validis, densatis. Tab. 8; T. 9, fig. 1 — 6. 



1825. Echinus asqiiituberculatus Bly. Diet. Se. Nat., XXVII, 



p. 76. 

 » » ) 1837. PniLirri.Arcli. Nat., 



III, p. 245, t. 5, 

 f. 8, 9. 



Echinocidaris » » 1846. Ag. Des. C. K., p. 



50, t. 15, f. 3. 

 » » » 1869. Desmoulins, Act. 



Soc. Lin. Bordeaux, 

 XXVII, p. 162, t. 

 11, f. 5, 6. 

 » » » 1872, 1873. TROSCH.,Arch. 



Xat., XXXVIII, p. 



308; XXXIX, p. 



335. 



1834. Echiuus pustulosus Bly. Actinol. t. 20, f. 2, nan p. 226. 



Arbacia » » 1872 — 1874, Al. Ag., Rev. 



p. 92, 402. 

 1841. Echiuus neapolitanus Delle Chlue, Descriz. e Notomia, 



IV, p. 32, V, p. 120, 

 t. 118, f. 11—22. 



Habitat mare Mediterraneum, et Atlanticum ad insulas Ca- 

 uarias, Capo-Verdenses, Azoreas. 



Testa ambitu leviter pentagonula, liemisphaerica, depressi- 

 uscula, altitudinc in adultis 0,5 1, 0,42, in junioribus 0,43,0,38 

 diametri. 



Basis planiuscula, ad intcrradia leviter tumida; stoma longi- 

 tudine 0,.f);j diametri testae. 



Calyx costalibus obtusis, poris sexualibus maguis juxta 

 apicem. 



Ambulacra leviter prominula, augusta, propc ambitum 0,3 1 

 intcrradii; in basi modice dilatata, demissa, vix immersa, zonae 

 latitudine 1,63 fulcri. 



